diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 008dbbcd92..c8f47d6224 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -851,4 +851,18 @@ x = __ENCODING__
     actual = e.backtrace.first[/\A#{Regexp.quote(__FILE__)}:(\d+):/o, 1].to_i
     assert_equal(expected, actual, bug5614)
   end
+
+  def test_shadowing_variable
+    assert_warning(/shadowing outer local variable/) {eval("a=1; tap {|a|}")}
+  end
+
+  def test_unused_variable
+    o = Object.new
+    assert_warning(/assigned but unused variable/) {o.instance_eval("def foo; a=1; nil; end")}
+  end
+
+  def test_named_capture_conflict
+    a = 1
+    assert_warning(/named capture conflict/) {eval("a = 1; /(?<a>)/ =~ ''")}
+  end
 end